On Mon, 11 Sep 2023 14:59:25 GMT, 温绍锦 <d...@openjdk.org> wrote:
>> The performance of optimizing DateTimeFormatter cannot be as fast as using >> ixed-length buffer directly. > > Of course, the optimization of DateTimeFormatter is more general, and we can > spend time doing it later. The format of toString is fixed, we can not use > DateTimeFormatter. > Have you considered potentially more generalizable optimizations to > `DateTimeFormatter.ISO_INSTANT.format(this)` here? > > Hand-rolling a fixed-length buffer, skipping the `StringBuilder` .. > understandably this can have a performance edge, but perhaps a > `DateTimeFormatter` like `ISO_INSTANT` can be optimized to get closer to > whatever speed-up this gets you - with broader implications. I submitted an optimization for the commonly used format of DateTimeFormatter::format ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/15658#discussion_r1323021409
